Wm caprice drive line thump

[UjisCaprice]

Hi all. First ever post. I have just picked up a MY08 White caprice V8 with only 65000kms. It still has the 3 month warranty on it so I want to fix all its problems as soon as possible. At the moment I'm getting a driveline thump when applying the throttle after coasting, it even thumps softly if the cruise backs off and starts accelerating again. I have taken it to Holden and they said no mounts are broken and the thump is normal for this model. I find it hard to believe this thump is normal. Have you guys got any ideas. I got under the car my self and checked the 3 diff mounts but there where good. TIA

 

[UjisCaprice]

Bump bump.........

 

[Grennan]

No thump should be normal. Did you buy the car from the same place you took it back? If so, take it somewhere else for a once over.

Common causes of thumps are the diff bushes, engine mounts and gearbox mount, would also be looking at the tailshaft couplings.

 

[UjisCaprice]

Thanks grennan. It's going to a different dealer because I bought it 3hours away. I'm just about to go for another drive with them today.

 

[UjisCaprice]

Sorta of good news, my local Holden has at least confirmed my concern with the answer of "excessive diff back lash" and will investigate when it goes in for a harmonic balancer and ac bracket next week. So hopefully the dealer I bought the car from comes to the party

 

[cewing]

Every commodore I've owned has diff thumping. IMO it's normal-and no I don't thrash my cars.

 

[Grennan]

Theres "common" and theres "normal".

Two very different things.

 

[UjisCaprice]

I expect some driveline "thud", I had a vy and a ba and always expect some driveline take up but this is enough to send a shock through the car... Will update in a week what the outcome is...

 

[UjisCaprice]

Car thump seems to be getting worse. Now it's thumping just from going to d and R. I got underneath while someone was doing it and noticed the diff pinion is turning almost 1/4 a turn. It turns and almost stops and then has a last little clunk and turns a bit more... Could someone have a look at there's while going R to d and back and see how much is turns so I can go to dealer...this is like getting blood out of a stone....

 

[UjisCaprice]

Hi all. I just got a diff out of a wreck and got it fitted. 3.27 lsd and superpro bush fillers. Clunking is gone.. Yay... Damn holder dealers saying it was normal... They have no idea